Does kombucha need to be in the the fridge or not ?
Have you ever noticed that, in shops, some bottles of kombucha are kept in the chilled section, whilst others are displayed on shelves at room temperature… but why the difference?
Behind this simple storage detail lies a major distinction.
Here’s why the cold is a live kombucha’s best friend.
1. Cold: the slow motion of fermentation.
Unpasteurised kombucha is a living drink. Unlike a standard fizzy drink, it contains an active community of yeasts and bacteria. At room temperature, these microorganisms consume the residual sugar, converting it into carbon dioxide and acid.The cold of the fridge acts as a natural brake. It puts these microorganisms into a sort of deep sleep, which helps to stabilise the drink’s flavour and balance.¹
2. Preserving the flavour balance
The flavour profile of kombucha relies on a delicate balance between sugar and acidity. When exposed to heat, acetic acid bacteria convert ethanol (produced by yeast) into acetic acid.A bottle left on a worktop for several days will lose its roundness and subtle notes of tea or fruit, becoming more acidic and resembling vinegar. Chilling helps to preserve this flavour balance established during the brewing process.²
3. Why are some bottles kept out of the fridge?
When a bottle of kombucha is kept out of the fridge, it almost always means that it has undergone a stabilisation process, most commonly pasteurisation. As explained in detail in our blog post : Pasteurised what does it actually mean ? (and how does it affect what’s in your glass ?), by heating the drink, the producer neutralises the microorganisms (bacteria and yeast).
This process offers undeniable logistical advantages, such as
- Long and stable shelf life: the best-before date can be up to two years without the risk of the drink ‘going off’.
- Simplified logistics: no need for refrigerated transport or storage, which significantly reduces costs.
However, this stability comes at the expense of the product’s biology. Heat destroys the bacteria and yeasts that are the primary appeal of a live fermented drink.
In summary: freshness is a guarantee of quality. Choosing a kombucha from the chilled section ensures you’re getting a product that hasn’t been denatured and remains alive. Fresh with benefits!
Disclaimer :
This article is for informational purposes only. Storage conditions vary by producer and product. When in doubt, check the label. And if it's not in the fridge, ask yourself why.
Sources :
¹.Villarreal Soto, S. A. (2019). Etude d'un procédé de fermentation de Kombucha : caractérisation chimique, microbienne et activités biologiques (Thèse de doctorat, Institut National Polytechnique de Toulouse). HAL Thèses. https://theses.hal.science/tel-04172207v1
²Aung, T., & Eun, J.-B. (2021). Impact of time and temperature on the physicochemical, microbiological, and nutraceutical properties of laver kombucha (Porphyra dentata) during fermentation. LWT, 148. https://www.sciencedirect.com/science/article/pii/S0023643821017965
